Phio Pharmaceuticals CEO buys 25,000 shares

Bitterman's reported post-purchase position was 789,871 shares, including shares underlying unvested restricted stock units.

Available on EDGAR 11/10/2026 - 11:17 AM EST Accepted by SEC EDGAR 11/10/2026 - 11:17 AM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Phio Pharmaceuticals Corp. Chairman, President and CEO Robert J. Bitterman purchased 25,000 common shares at $0.82 per share on November 9, 2026. His direct holdings after the purchase were 789,871 shares, including shares underlying unvested restricted stock units. No Rule 10b5-1 plan is reported.

Insider Trade Summary

Net Buyer: 25,000 shares

Net Buy 1 txn

Insider Bitterman Robert J

Role Chairman, Pres. & CEO

Bought 25,000 shs ($21K)

Increase in Position 3.3%

Type	Security	Shares	Price	Value
Purchase	Common Stock, $.0001 par value F1	25,000	$0.82	$21K

Holdings After Transaction: Common Stock, $.0001 par value — 789,871 shares (Direct)

Holdings Before and After: Common Stock, $.0001 par value, 764,871 to 789,871 shares (Direct)

Footnotes (1)

1. F1. Includes shares of common stock underlying unvested restricted stock units.

Key Figures

Shares purchased: 25,000 shares Price per share: $0.82 per share Direct shares following purchase: 789,871 shares

3 metrics

Shares purchased 25,000 shares November 9, 2026

Price per share $0.82 per share Purchase on November 9, 2026

Direct shares following purchase 789,871 shares Includes shares underlying unvested restricted stock units

Key Terms

restricted stock units, par value

2 terms

restricted stock units financial

"shares of common stock underlying unvested restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

par value financial

"Common Stock, $.0001 par value"

Par value is the fixed amount printed on a bond or stock that represents its original value when issued. It’s like the face value of a coin or bill—what the issuer promises to pay back or the starting price of a stock—though it often doesn’t change with market prices. It matters because it helps determine certain financial details, like how much the company will pay back at maturity.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many PHIO shares did Robert J. Bitterman buy?

Robert J. Bitterman purchased 25,000 shares at $0.82 per share on November 9, 2026.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Bitterman Robert J

(Last) (First) (Middle)

C/O PHIO PHARMACEUTICALS CORP.

411 SWEDELAND RD., STE 23-1080

(Street)

KING OF PRUSSIA PENNSYLVANIA 19406

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Phio Pharmaceuticals Corp. [ PHIO ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chairman, Pres. & CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
11/09/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, $.0001 par value	11/09/2026		P		25,000	A	$0.82	789,871(1)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Includes shares of common stock underlying unvested restricted stock units.

	/s/ Lisa C. Carson, Attorney-in-fact	11/10/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)